Although Cleary stand accused of attacking the website of Britain's Serious and Organised Crime Agency (Soca), the hacker could eventually be extradited to the United States to face additional charges.

"[Ryan] would have to be charged here first if any offense has been committed, because he was allegedly attacking the Soca website when he was arrested," a source told the UK's Telegraph.

"But the investigation into his activities was being driven by the FBI, and it seems likely they will want to have him extradited to the US so they can question him about attacks on American websites."